let a=20;
const c="hello";
console.log("c:",c);

console.log(a);

function say(){
	let b=30;
	const d=50;
	console.log("say-d",d);
	console.log("say-c",c);
	console.log("b:",b);
	console.log(a);
}
let b="hello";
say();
const student=new Object();
student.name='tom';
student.age=20;
student.name='terry';
const student=new Object();
console.log(student);

console.log(a);






